Last Modified: Jun 28, 2025
Affected Product(s):
BIG-IP TMOS
Known Affected Versions:
16.1.5, 16.1.5.1, 16.1.5.2, 16.1.6, 17.1.2.1, 17.1.2.2
Opened: Jun 24, 2025 Severity: 3-Major
Stale Record Answers counter increments incorrectly when no stale record is served and a SERVFAIL is sent.
Leads to incorrect Stale Record Answers stat, potentially misleading monitoring, troubleshooting, and operational decisions.
-- Configure DNS cache resolver with a forwarder. -- Make sure forwarder does not respond to DNS queries. -- Enable 'ltm dns cache global-settings serve-expired' -- Send a few DNS requests to DNS cache for a record which is to be handled by not responding forwarder. -- Observe 'Stale Record Answers' counter for DNS cache.
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